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EP0615495A1 - Means for filling an airbag. - Google Patents

Means for filling an airbag.

Info

Publication number
EP0615495A1
EP0615495A1 EP92922835A EP92922835A EP0615495A1 EP 0615495 A1 EP0615495 A1 EP 0615495A1 EP 92922835 A EP92922835 A EP 92922835A EP 92922835 A EP92922835 A EP 92922835A EP 0615495 A1 EP0615495 A1 EP 0615495A1
Authority
EP
European Patent Office
Prior art keywords
gas
container
filled
retardation
vessel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92922835A
Other languages
German (de)
French (fr)
Other versions
EP0615495B2 (en
EP0615495B1 (en
Inventor
Orvar Svensson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGA AB
Original Assignee
AGA AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=20384564&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0615495(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by AGA AB filed Critical AGA AB
Publication of EP0615495A1 publication Critical patent/EP0615495A1/en
Application granted granted Critical
Publication of EP0615495B1 publication Critical patent/EP0615495B1/en
Publication of EP0615495B2 publication Critical patent/EP0615495B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B60R21/26—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow
    • B60R21/268—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags characterised by the inflation fluid source or means to control inflation fluid flow using instantaneous release of stored pressurised gas

Definitions

  • the present invention relates to an arrangement for filling an empty flexible container essentially instanta ⁇ neously with a gas when the speed of an automotive vehicle in 5 which the container is installed is greatly and abruptly re ⁇ tarded, wherein the container is intended to prevent injury to person or persons present in the vehicle, or to reduce the extent of the injury sustained in the event of a collision for instance.
  • the temperature will fall by about 70 to 100 degrees.
  • the gas is stored in high pressure containers, it is either necessary to supply corresponding heat to the gas so as to obtain the volume that would be obtained at room temperature, or the pressure container must be filled with about 30% more gas.
  • One object of the present invention is to provide appa- ratus for filling an empty, flexible container with gas essentially instantaneously in the event of an abrupt retar ⁇ dation in the speed of an automotive vehicle, said gas-filled container functioning as a force-absorbing cushion so as to reduce the extent of the injuries that may be sustained.
  • the arrangement includes a gas-filled pressure vessel under high pressure, a conduit which connects the pressure vessel to the container, a mechanical opening device for opening the con- nection between the vessel and the container when retardation exceeds a smallest value, and a retardation meter.
  • Gases which exhibit a reverse Joule-Thomson effect are hydrogen and helium and mixtures thereof.
  • the advantage of helium is that it is not combustible and will not sustain combustion. Another advantage is that even small leakages of the gas can be detected.
  • the drawback with helium is that it is a relatively expensive gas.
  • hydrogen is an abundant element and therefore relatively inexpensive. Pure hydrogen gas burns in air and is therefore not suitable for use in its pure form. According to the present invention, there is used a hydrogen- helium mixture which is not ignitable in air.
  • hydrogen and helium are gases which have low molecular weights, which means that they have high outflow velocities in comparison with gases of higher molecu ⁇ lar weights.
  • the outflow velocity of hydrogen and helium is approximately three times greater than the outflow velocity of air under corresponding conditions.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Bags (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

PCT No. PCT/SE92/00639 Sec. 371 Date Jun. 9, 1994 Sec. 102(e) Date Jun. 9, 1994 PCT Filed Sep. 18, 1992 PCT Pub. No. WO93/11971 PCT Pub. Date Jun. 24, 1993.The present invention relates to an arrangement for filling a flexible container with gas essentially instantaneously upon the occurrence of powerful retardation forces, wherein the gas-filled container functions as a force-absorbing cushion for protection against injury. The arrangement includes a gas-filled high-pressure vessel, a conduit which connects the pressure vessel to the container, a mechanical opening device for opening the connection between the vessel and the container upon the occurrence of a retardation force which exceeds a smallest value, and a retardation meter. The arrangement is characterized in that the vessel is filled with a gas which exhibits a reversed Joule-Thomson effect.

Description

Means for filling an airbag
The present invention relates to an arrangement for filling an empty flexible container essentially instanta¬ neously with a gas when the speed of an automotive vehicle in 5 which the container is installed is greatly and abruptly re¬ tarded, wherein the container is intended to prevent injury to person or persons present in the vehicle, or to reduce the extent of the injury sustained in the event of a collision for instance.
10 Certain cars are equipped with so-called airbags as an alternative or as a supplement to standard vehicle safety harnesses. These bags are swiftly inflated in front of the driver or passengers of the vehicle in the event of a colli¬ sion, so as to shield the driver or passengers from such
15 injuries as those which might be inflicted when thrown for¬ wards against the steering wheel or the instrument panel.
Hitherto, vehicles have not been equipped with airbags for backseat passengers. The reason is possibly because backseat passengers would require much larger bags, which is
20 probably associated with a number of problems which can be related purely to gas kinetics.
In the event of a head-on collision, or any other colli¬ sion, in which the vehicle is stopped very quickly, it is necessary for the container to be inflated with gas and form
25 an airbag or a gas cushion before the person is thrown for¬ ward against the backrest of the front seat or against the steering wheel/or the instrument panel at the initial speed of the vehicle.
In order to obtain effective protection, it is estimated
30 that the airbag must be inflated within one-hundredth of a second. it Assuming that a car is travelling at a speed of 110
'-X km/hour when a collision occurs, a person seated in the car will be moved through a distance of about 0.3 meter in rela-
35 tion to the ground in this time. Since the actual body of the vehicle will not stop instantaneously, owing to the fact that the front of the vehicle is buckled-in through a distance of one or more decimeters, the driver or passengers of the vehicle have time to move about one to two decimeters rela¬ tive to the vehicle body in 0.01 seconds, which means that the airbag has time to inflate and to prevent the driver or passengers being thrown onto the driving wheel, the instru¬ ment panel or the backrest of the seat in front.
When a gas, which in this gas expands without the ex¬ change of energy (iso-enthalpy) , the temperature will normal¬ ly fall in accordance with the so-called Joule-Thomson ef- feet.
In the case of air or nitrogen, which is permitted to expand from 400 to 2 bars, the temperature will fall by about 70 to 100 degrees. When, as in the case of airbags, the gas is stored in high pressure containers, it is either necessary to supply corresponding heat to the gas so as to obtain the volume that would be obtained at room temperature, or the pressure container must be filled with about 30% more gas.
In addition to this drop in temperature, it must be remembered that air, nitrogen and other gases have a com- pressibility factor of about 1.2 at 400 bars, which must be taken into account when dimensioning the container, since otherwise the pressure or the volume must be increased to a corresponding degree in accordance with the case of an ideal gas. Another problem associated with all heavy gases is that, in the present case, the outflow velocity of the gas would be relatively low, since this gas velocity is a function of both molecular weight and temperature.
One object of the present invention is to provide appa- ratus for filling an empty, flexible container with gas essentially instantaneously in the event of an abrupt retar¬ dation in the speed of an automotive vehicle, said gas-filled container functioning as a force-absorbing cushion so as to reduce the extent of the injuries that may be sustained. The arrangement includes a gas-filled pressure vessel under high pressure, a conduit which connects the pressure vessel to the container, a mechanical opening device for opening the con- nection between the vessel and the container when retardation exceeds a smallest value, and a retardation meter.
This object is realized in accordance with the invention with an arrangement having the characteristic features set forth in the main Claim. Advantageous further developments of the inventive arrangement are set forth in the depending
Claims.
Gases which exhibit a reverse Joule-Thomson effect are hydrogen and helium and mixtures thereof. The advantage of helium is that it is not combustible and will not sustain combustion. Another advantage is that even small leakages of the gas can be detected. The drawback with helium is that it is a relatively expensive gas.
On the other hand, hydrogen is an abundant element and therefore relatively inexpensive. Pure hydrogen gas burns in air and is therefore not suitable for use in its pure form. According to the present invention, there is used a hydrogen- helium mixture which is not ignitable in air.
In addition to the advantage of exhibiting a reverse Joule-Thomson effect, hydrogen and helium are gases which have low molecular weights, which means that they have high outflow velocities in comparison with gases of higher molecu¬ lar weights. The outflow velocity of hydrogen and helium is approximately three times greater than the outflow velocity of air under corresponding conditions.
It is very important that a pressurized airbag-filling container will not leak in the event of a collision and that the container will maintain the necessary pressure for many years after being filled. Because highly sensitive helium leakage detectors are available, it is convenient for the gas used to contain helium.

Claims

1. An arrangement for filling a flexible container essen¬ tially instantaneously with gas upon the occurrence of power¬ ful retardation forces, wherein the gas-filled container functions as a force-absorbing cushion for protection against injury, and wherein the arrangement includes a gas-filled high-pressure vessel, a conduit which connects the pressure vessel to the container, a mechanical opening device for opening the connection between the vessel and the container upon the occurrence of a retardation force which exceeds a smallest value, and a retardation meter, characterized in that the vessel is filled with a gas which exhibits a re¬ versed Joule-Thomson effect.
2. An arrangement according to Claim 1, characterized in that the gas is a mixture of hydrogen and helium.
3. An arrangement according to Claim 2, characterized in that the hydrogen concentration of the gas mixture is below the value at which the mixture is combustible in the presence of ambient air.
4. An arrangement according to Claim 2 or 3, characterized in that the gaseous mixture contains less than 15 percent by volume hydrogen.
EP92922835A 1991-12-10 1992-09-18 Means for filling an airbag Expired - Lifetime EP0615495B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9103649 1991-12-10
SE9103649A SE9103649D0 (en) 1991-12-10 1991-12-10 FILLING OF AIR CUSHION
PCT/SE1992/000639 WO1993011971A1 (en) 1991-12-10 1992-09-18 Means for filling an airbag

Publications (3)

Publication Number Publication Date
EP0615495A1 true EP0615495A1 (en) 1994-09-21
EP0615495B1 EP0615495B1 (en) 1996-01-31
EP0615495B2 EP0615495B2 (en) 1999-03-24

Family

ID=20384564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92922835A Expired - Lifetime EP0615495B2 (en) 1991-12-10 1992-09-18 Means for filling an airbag

Country Status (13)

Country Link
US (1) US5527066A (en)
EP (1) EP0615495B2 (en)
JP (1) JP3309222B2 (en)
AT (1) ATE133619T1 (en)
BR (1) BR9206903A (en)
CA (1) CA2124575C (en)
DE (1) DE69208103T3 (en)
DK (1) DK0615495T3 (en)
ES (1) ES2084389T5 (en)
FI (1) FI942656A0 (en)
NO (1) NO300721B1 (en)
SE (1) SE9103649D0 (en)
WO (1) WO1993011971A1 (en)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5782486A (en) * 1993-07-16 1998-07-21 New Lenox Industries, Inc. Rapid gas-fill apparatus and method
US7744122B2 (en) * 1995-12-12 2010-06-29 Automotive Technologies International, Inc. Driver side aspirated airbags
US6221186B1 (en) * 1996-04-15 2001-04-24 Autoliv Asp, Inc. Self-compensating airbag inflator and method
US5863067A (en) * 1996-12-05 1999-01-26 Trw Vehicle Safety Systems Inc. Vehicle occupant protection apparatus
US6024379A (en) * 1997-05-01 2000-02-15 Trw Vehicle Safety Systems Inc. Vehicle occupant protection apparatus
US5906394A (en) * 1997-11-18 1999-05-25 Trw Inc. Completely non-pyrotechnic air bag inflator
CA2418969C (en) * 2000-08-11 2008-06-10 Frieder Flamm Gas generator and restraint system for a vehicle
US7252303B2 (en) * 2000-08-29 2007-08-07 Daicel Chemical Industries, Ltd. Inflator
EP1346885B1 (en) * 2000-12-27 2008-11-12 Daicel Chemical Industries, Ltd. Inflator
JP4864251B2 (en) 2001-02-26 2012-02-01 株式会社ダイセル Inflator
JP2003095056A (en) 2001-09-27 2003-04-03 Daicel Chem Ind Ltd Pressurized medium for inflator
US6883830B2 (en) 2001-09-27 2005-04-26 Daicel Chemical Industries, Ltd. Pressurized medium for inflator
US6554315B2 (en) 2001-09-27 2003-04-29 Trw Inc. Inflatable vehicle occupant protection device
JP2003182506A (en) 2001-12-14 2003-07-03 Daicel Chem Ind Ltd Rupture disk for inflator
US7032925B2 (en) * 2001-12-14 2006-04-25 Daicel Chemical Industries, Ltd. Rupturable plate for inflator
US20040041382A1 (en) * 2002-03-19 2004-03-04 Yuzo Gotoh Inflator with a cap
US6726243B2 (en) 2002-05-31 2004-04-27 Autoliv Asp, Inc. Tuning the performance of compressed gas-containing inflators
US6962365B2 (en) 2003-03-04 2005-11-08 Autoliv Asp, Inc. Inflation gas generation devices and methods utilizing joule-thomson heating
DE102005056101A1 (en) * 2005-11-24 2007-05-31 Linde Ag Air bag filling method for use in automotive industry, involves filling airbag with more than two different gases, where one of utilized gases is helium, and other gas is selected from group of helium, nitrogen and hydrogen
US8640468B2 (en) 2008-05-21 2014-02-04 Raytheon Company Isothermal gas supply and method for minimizing the temperature excursion of a gas mixture released therefrom
JP2017516458A (en) 2014-03-24 2017-06-22 ジェネンテック， インコーポレイテッド Cancer treatment with c-met antagonist and correlation with HGF expression of c-met antagonist
CN113320403A (en) 2015-07-06 2021-08-31 深圳市大疆创新科技有限公司 System and method for unmanned aerial vehicle fuel cell

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3680886A (en) * 1969-12-16 1972-08-01 Ara Inc Safety cushion air system
US3756621A (en) * 1971-11-03 1973-09-04 Allied Chem Argon compressed gas supply
US3868124A (en) * 1972-09-05 1975-02-25 Olin Corp Inflating device for use with vehicle safety systems
FR2257466A1 (en) * 1974-01-16 1975-08-08 Eaton Corp Inflatable support system - for the occupant of a motor vehicle in the event of a crash
FR2560194B1 (en) * 1984-02-27 1987-08-07 Midy Spa 3-AMINOAZETIDINE, ITS SALTS, PROCESS FOR THEIR PREPARATION AND SYNTHESIS INTERMEDIATES
US5031932A (en) * 1990-04-05 1991-07-16 Frantom Richard L Single pyrotechnic hybrid inflator
JP3203063B2 (en) * 1991-09-18 2001-08-27 ティーアールダブリュー・ヴィークル・セーフティ・システムズ・インコーポレーテッド Vehicle occupant restraint
US5348344A (en) * 1991-09-18 1994-09-20 Trw Vehicle Safety Systems Inc. Apparatus for inflating a vehicle occupant restraint using a mixture of gases

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9311971A1 *

Also Published As

Publication number Publication date
JPH07501770A (en) 1995-02-23
US5527066A (en) 1996-06-18
SE9103649D0 (en) 1991-12-10
DK0615495T3 (en) 1996-05-06
NO942172L (en) 1994-06-10
ATE133619T1 (en) 1996-02-15
EP0615495B2 (en) 1999-03-24
ES2084389T5 (en) 1999-06-01
DE69208103T3 (en) 1999-12-30
DE69208103T2 (en) 1996-05-30
ES2084389T3 (en) 1996-05-01
NO300721B1 (en) 1997-07-14
CA2124575A1 (en) 1993-06-24
DE69208103D1 (en) 1996-03-14
CA2124575C (en) 1996-09-17
EP0615495B1 (en) 1996-01-31
WO1993011971A1 (en) 1993-06-24
NO942172D0 (en) 1994-06-10
JP3309222B2 (en) 2002-07-29
FI942656A (en) 1994-06-06
FI942656A0 (en) 1994-06-06
BR9206903A (en) 1995-11-21

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